Adding proxy address in Exchange 2007

Hi there,
We have recently moved a client from SBS 2003 to SBS 2008.  In the process we changed the domain name.  One of the problems I have encountered is that when a user replies to an old email they get a bounce back.  I think this is because the old email address refers to the old server (and old domain).  The user can workaround by forwarding the message and adding the address from the new address list.  This doesn't seem to be affecting external email in.
I have been told that an additional proxy address may need to be adding but can't find a way how in the new 2007 Exchange gui.  Can someone help me out.?
Who is Participating?
endital1097Connect With a Mentor Commented:
add an X500 address for the recipient
Gianpiero RossiSystem AdministratorCommented:
try to add the old domain to the new, in the authorative domain.
it should work

tell me if it is fine.

neal2206Author Commented:
Thanks for replying.
Sorry I don't understand what you are asking me to do.  Can you be more specific?
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Gianpiero RossiSystem AdministratorCommented:
you can tell to exchange server to receive e.mail sent to the old domain es: old.domain.local
that could be done adding this domain to the accepted domain of exchaneg server.
in the Exchange server management console:
Organization configurazion -> hub transport -> accepted domain
there add a domain with the name of your old domain.
go into recipient configuration
double click the user and go to the email addresses tab

if you want the new address to be the primary, you must remove the checkbox at the bottom
neal2206Author Commented:
If I have a look at the Outlook contact properties of the user for one of the emails which bounce there is a reference to the old domain and the old server - see below

Diagnostic information for administrators:

Generating server: NEWSERVERNAME.domain.local

#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
Gianpiero RossiSystem AdministratorCommented:
mmmmm this is the x400 transport protocol.
neal2206Author Commented:
Thanks for all the comments - endital1097 got it right for me..
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